rcmd for remote execution

shivaligupta · 06-07-2005, 04:29 AM

I want to execute one command "poweroff" on one pc after getting an instruction from other pc. i tried rcmd but m not able to get tht how to use it. i m implementing my program in C/C++
plz help if u know anything about rcmd or anyother way to do this.
thanks in advance

huibert.alblas · 06-07-2005, 08:24 AM

I would suggest usinf SSH, I don't know if it is a good idea to hack into a C programm or how to do it.
I'm more a bash/java hacker kind of guy.

Other wise I can think a et least 10 other ways how to remotly shutdown a computer runninf linux...
But don't have the time to write them down right now :-)

Depends if you _need_ C as a language (school asignment ?) or just want to get the job done.

Happy hacking

shivaligupta · 06-09-2005, 10:41 PM

If u know 10 other ways plz tell me two or three. i really want to know them
thanks

huibert.alblas · 06-10-2005, 06:19 AM

Simplest way:
(1)

Code:

ssh root@rometesite -c "halt"

Better:
(2)

Code:

ssh user@remote
bash ~/ > sudo halt
(enter password)

Nifty but dumb (every local user /every body with write permissoin to /tmp can shutdown your computer):
(3)

Code:

- create script which:
 - checks for file /tmp/shutdown.txt
 - if file exists do shutdown
 - else NOP
Put script in roots crontab

Server
(4)

Code:

- create some kind of socket listner server, listing on som port
- connect to server, put message in socket stream
- if message is "shutdown" do shutdown

(5)
Add some authentication to (4)

(6)
If you look at it the right way, you will see that (5) is basicly (2) but very primitive.

(7)
Combine any of the above...

user your imagination:
What you basicly want ist to dispatch a message from computer Remote1 to computer remote2.
If message correct, then Remote2 must do shutdown.

In stead of ssh you could use HTTP, FTP, SFTP, SMTP or whatever other protocol to comunicate.

"Free your mind, and the rest will follow!"

Happy hacking